Pulp stock agitating apparatus



July 4 '1939- J. A. RQsMm l 2,164,944

PULP STOCK AGITATING APPARATUS Filed June 10, 1936 2 Sheets-Sheet I c/o/z Foa/wait ATTORNEY.

July 4, 1939. J. A. RosMAlT PULP sTocx AGITATINC- APPARATUS Filed June 1o. 123:56v 2 sheets-sheet ill'- g .5 /0 4 4%,

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ATTORNEY terminating adjacent to opposite walls of the Patented July 4,I Y1939 UNITED STATES PATrsfN'r OFI-lcs 3 Claims.

My invention relates to improvements in pulp stock 'storage chestsv and 'agitating apparatus' stock various devices are provided for agitating. Various types of Imechanism have4 the same. heretofore been provided for recirculating the pulp stock. My invention relates to a chest provided with improved recirculating mechanism adapted to maintain the pulp stock within the chest in a uniform conditionthroughout.

Varioustypes of chests have been provided in the paper industry. These are long rectangular chests, upright cylindrical chests, and chests of various sizes and shapes. The particular embodiment of recirculating apparatus here illustrated is particularly usefulin connection with a chest the length of which is substantially greater than its width or height and which is referred to herein as an elongate chest. An object of the invention is to provide recirculating apparatus communicating with a chest of the character described which apparatus is adapted to Withdraw pulp stock from a depressed portion of the chest o'or and to deliver the stock against separated upper portions of the chest wall.

A feature of importance is that the pump is provided with a plurality of aring outlets chest at the top thereof. Another feature is that the pump intake and ,collector basin, sump, or depressed portion of the floor of the chest from which pulp stock is withdrawn by the pump intake, is surmounted by a dome shaped baffle which is adapted to cause the pulp stock to flow outwardly thereover 4toward the side wall of the chest and to cause such stock to enter the pump intake by 'flowing inwardly under the outer margin of the baille and underneath the`batlie.

Another meritorious feature is that additional pulp stock may be delivered into the ilaring outlets of the pump. This delivery maybe by pulp conduits which'enter into the interior of these pump outlets.V These conduits may enter the pump outlets so as to deliver additional pulp stock thereinto counter to the direction of flow of pulp stock through the outlets from the pump.

An important characteristic is that the pump is of the axial now type. In the preferred embodiment it has an intake Ithat extends downwardly vertically into the chest to a point adjacent to the floor thereof. 'I'his pump intake is disposed substantially centrally of the chest and the chest floor slopes downwardly Itoward such intake from all sides. The pump is provided with discharge outlets that extend toward opposite ends of the chest to discharge the pulp stock `adjacent to said ends.

Various other objects, advantages, andl meritorious features of my improved construction will more fully appear from the following description, appended claims and accompanying drawings, wherein: l Y,

Figure 1 is a vertical longitudinal sectional View through a pulp stock storage chest embodying my invention, 20

Fig. 2 is a horizontal cross-sectional view taken on line 2-2 of Fig. 1,

Fig. 3 is a plan of a pulp stock storage chest embodying my invention in a form slightly modified as compared with the construction shown in Figs. 1 and 2, and

Fig. 4 is a vertical sectional .view taken on the line 4--4 of Fig. 3.

In the various embodiments of the invention 1 illustrated in the several gures of the drawings 30 an elongate rectangular` type of chest I0 is illustrated. This chest is provided with a floor l2 which slopes downwardly from all sides toward a depressed portion,fcollector basin, or sump I4. This chest may-be made of suitable materials well known in the, industry such as concrete. It is made in such-size as is desired for the installation sought. f.'

In the embodiment shown in Figs. 1 and 2 there is provided an axial flow pump driven by a motor I6. 'I'his motor may be supported from the ceiling I 8 ofjiie tank. 'I'here is a tubular pump intake 20 which extends downwardly vertically into the chest terminating Within the collector basin I4. Pump impeller 22 is driven by a shaft 24. Pulp stock is withdrawn through the pump. intake 20 and discharged through flaring pump outlets 26.'

The pump is here shown as provided with a -pair of laringdischarge outlets 26 which ex- 50 tend across the upper portion ofthe chest as shown in Figs. l and 2 toward opposite ends of the chest. These outlet tubes may be suspended from brackets or bands -28 or the like. They terminate adjacent to the end Walls of the chest 55 and supported by legs 32 or the like.

' above the floor oi the chest. It is adapted to direct the pulp stock outwardly toward the side wall of the chest and to cause the same to ilow inwardly underneath the margin of the baille to enter the sump I4. The baille may be provided with a pair of apertures 33 adjacent to its upper end to permit a certain amount of pulp stock to ow through to prevent the pulp stock collecting as a dead mass underneath the baille.l

Conduits 34 may extend from beaters or the like to deliver additional pulp stock into the pump outlets 26. The pump outlets are shown as provided with apertures 36 into which overilow conduits from Jordans or the like may discharge additional pulp stock.

The pump outlets increase in diameter as they approach their discharge end. The additional pulp stock admitted thereinto mixes with the pulp stock being recirculated by the pump causing` the stock to turn over and over as it flows through the outlets. This produces a more thorough admixture of pulp stock than would be the case if delivery were Amade directly into the chest from these additional sources. The bringing of the pulp stock from the center of the chest at the bottom up to the top of the chest and its discharge into thetop of the chestagainst the opposite end walls and the provision of the bafile surmounting the pump intake all tend to produce thorough admixture and de-aeration of the pulp stock.` It promotes eillciency of the recirculating mechanism and produces an eiective thorough admixture .of the stock so as to prevent the formation of dead spots therein. The stock so recirculated is maintained at a substantially uniform consistency throughout.

In Figs. 3 and 4 is shown a modiilcation of the construction shown in Figs. 1 and 2. The pump is indicated as 40. It is driven by a. suitable motor 42. The pump intake 44 is adapted to withdraw pulp stock from the sump I4 of the chest.

The pump has a delivery outlet 46 which terminates within the chest in two oppositely directed flaring discharge outlets 48. These discharge outlets are adapted to discharge pulp stock delivered by the pump against opposite ends of the chest as hereinabove described in connec- "tion with the embodiment shown in Figs. 1 and 2.

'I'he collector basin and pump intake is surmounted by a crown shaped baille 50 which is supported spaced above the iloor of the chest by supports 52. This baille differs from the baille shown in Figs. l and 2 in that it is provided with a large number of apertures 54 through which pulp stock can ilow as well asunderneath the margin ofthe baille.

The conduits 56 for delivery of additional pulp from the beaters or the like are shown as entering into the interior of the pump outlets and terminating within-such interior adjacent to the centerline of said outlets as shown in dotted line in Fig. 3. These conduits 56 also enter the interior of the pumpv outlets so that the pulp delivered through the conduits is not only directed into the center of the 'pulp streams flowing through the outlets but is directed thereinto counter to the direction of flow of the pulp stream through the outlets. These conduits 56 may communicate with beaters 58 as shown in Fig. 4. Otherwise the construction is as heretofore shown .and described.

According to the embodiments of the invention illustrated pulp stock is withdrawn from a low portion oi' the chest floor at approximately .the center thereof and delivered into the top of the chest against the side walls oi the chest and this is true whether the pump is located directly over the chest as shown in Figs. 1 and 2 and communicates therewith through an intake depending vertically below the pump or whether the pump is located outside theV chest and communicates through an intake shown as illustrated in Figs. 3 and 4. In either case an additional pump may be provided to withdraw pulp stock from the lchest i'or usein the manufacture of paper. This forms no part ofthe invention and is not here illustrated. Such connection for deliveryto the remainder of the system might be with the outlet of the pulp recirculating mechanism if desired.

What I claim is:

l. A storage chest for pulp stock having a oor sloping toward a depressed sump portion; a pump having an intake extending vertically down into the `chest and into the depressed sump portion thcreoi terminating above the floor of the sump portion to withdraw pulp stock therefrom. a dome-shaped baille encircling the pump intake adjacent to its lower end, said baille extending outwardly and downwardly from the pump intake surmouniing the depressed iloor portion of the chest and spaced thereabovc, and extending outwardly over the floor of the chest beyond said sump, said pump having oppositely directed discharge outlets adapted to deliver pulp stock into the chestadjacent to spaced apart portions ofv its side walls, each of said outlets ilaring from a portion of 'reduced diameter at its intake end toward a portion of maximum diameter at its outlet end and means for delivering additional pulp stock into said outlets to mix with the pulp stock ilowing therethrough from said pump, said pumpintake terminating within the sump in a flaring end portion spaced from the sump wall and below the chest floor to cause the pulp stock to bend sharply as it flows through the sump into said pump intake.

2. In a pulp stock storage chest, a oor sloping gradually downward toward substantially the center of the chest, said iloor having a sump in substantially the center thereof towards which the pulp stock in the chest is directed by the sloping floor, a pipe system for causingV continuous circulation of pulp stock in the chest, said pipe system having an intake pipe extending into said sump and having an intake opening below the upper edge of said sump but spaced from the bottom thereof. theposition of said intake open'- ing causing the flow lines of said pulp stock to bend sharply as they pass into the sump and thus into the intake opening whereby the pulp stock is agitated and mixed before entering said intake opening, a dome shaped baille surmounting said sump in spaced relationship and extending outwardly'over the iloor beyond the-margin of the sump, said pipe system including a pump comg municating withsaid intake and oppositelyv directed outlets terminating adjacent opposedk por; tions of the tank walls. each outlet increasing in diameter from its intake end toward its discharge end. A Y Y 3. A storage chest for pulp stock having a iloor sloping toward a depressed portion, a 'r-shaped pump structure having its upright portion serving as the pump intake extending vertically down into the chest and communicating with the depressed oor portion thereof to withdraw pulp stock upwarc'Lv therefrom, and a crown shaped baille surrounding the pump intake and ilaring outwardly and downwardly therefrom surmounting in spaced relationship the depressed iloor p0rtion of the chest and projecting outwardly over the iloor of the chest substantially beyond the depressed oor portion of the chest, said pump having the arms of the T-shaped structure serving as oppositely extending outlets leading toward opposite side walls of the chest and terminating adjacent thereto. each o! said loutlets flaring from a minimum diameter portion at its intake end toward a maximum diameter portion at its outlet end.

` JOHN A. ROSMA'IT. 

